A process for the preparation of an organo-polysulfide

Abstract

The present disclosure relates to a process for the preparation of an organo-polysulfide from a chlorinated hydrocarbon and an elemental sulfur waste. The organo-polysulfide of the present disclosure has a coke inhibition ability.

1 . A process for preparing an organo-polysulfide, said process comprising the following steps:
 a) mixing at least one chlorinated hydrocarbon and elemental sulfur in a pre-determined ratio to obtain a mixture;   b) heating said mixture at a first pre-determined temperature for a time period in the range of 3-6 hours to obtain a heated solid mass;   c) cooling said heated solid mass to obtain a cooled solid mass;   d) washing said cooled solid mass with a fluid medium to obtain a wet mass; and   e) drying said wet mass at a second pre-determined temperature to obtain organo-polysulfide.   
     
     
         2 . The process as claimed in  claim 1 , wherein said chlorinated hydrocarbon and said elemental sulfur are by-products obtained from a chemical plant. 
     
     
         3 . The process as claimed in  claim 1 , wherein said chlorinated hydrocarbon is at least one selected from the group consisting of ethylene chloride, trichloroethane, polyvinyl chloride, polyvinylidene chloride, halobutyl rubber and ethylene chloro trifluoro ethylene polymer. 
     
     
         4 . The process as claimed in  claim 1 , wherein the weight ratio of said chlorinated hydrocarbon to said elemental sulfur is in the range of 20:1 to 2:1. 
     
     
         5 . The process as claimed in  claim 1 , wherein said first pre-determined temperature is in the range of 170° C.-250° C. 
     
     
         6 . The process as claimed in  claim 1 , wherein said fluid medium is at least one selected from the group consisting of dichloromethane, chloroform, carbon tetrachloride, ethylenedichloride, chlorobutane and water. 
     
     
         7 . The process as claimed in  claim 1 , wherein said second pre-determined temperature is in the range of 100-130° C. 
     
     
         8 . An organo-polysulfide of structural formula R-C-S-S-C-R, wherein said organo-polysulfide is characterized by a sulfur content of more than 40 wt. % of the total weight of said organo-polysulfide, a carbon content of less than 25 wt.% of the total weight of said organo-polysulfide and a hydrogen content of less than 5 wt.% of the total weight of said organo-polysulfide, wherein R in said organo-polysulfide is independently selected from at least one alkyl and aryl group. 
     
     
         9 . The organo-polysulfide as claimed in  claim 8 , wherein the sulfur content of said organo-polysulfide is in the range of 40 to 70 wt.%. 
     
     
         10 . The organo-polysulfide as claimed in  claim 8 , wherein the carbon content of said organo-polysulfide is in the range of 15 to 25 wt.%. 
     
     
         11 . The organo-polysulfide as claimed in  claim 8 , wherein the hydrogen content of said organo-polysulfide is in the range of 1 to 5 wt.%.